Add libtest_missing_symbol_child_private.

Bug: http://b/77236525
Bug: http://b/77276121
Test: builds
Change-Id: I7398a7f5ecefcda37d1e9e4ab6cd85c3071e9648
diff --git a/tests/Android.bp b/tests/Android.bp
index eaa56c6..fb0e8b1 100644
--- a/tests/Android.bp
+++ b/tests/Android.bp
@@ -545,6 +545,7 @@
         "libtest_init_fini_order_root2",
         "libtest_init_fini_order_root",
         "libtest_missing_symbol_child_public",
+        "libtest_missing_symbol_child_private",
         "libtest_missing_symbol_root",
         "libtest_missing_symbol",
         "libtest_nodelete_1",